Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 49 (STARTING SYSTEM)SELF-DIAGNOSTIC SYSTEMENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECKTEST DESCRIPTION
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Test Description
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Test Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Perform battery inspection test. See BATTERY INSPECTION/TEST (NON-HP2) under ON-VEHICLE TESTING. If problem exists, repair as necessary. If problem does not exist, go to next step.
- Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, repair as necessary. See BODY CONTROL MODULES .
- Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The following procedure will determine the particular condition. Using scan tool, attempt communication with the powertrain control module (PCM) on class 2 serial data circuit. If scan tool communicates with any module, go to next step. If scan tool does not communicate with any module, repair communications concern. See BODY CONTROL MODULES .
- The symptom list in Symptoms will determine the correct diagnostic procedure to use. Using scan tool, select DISPLAY DTCs function for each module. Record all displayed DTCs, DTC status, and module which set the DTC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair starting system by symptom. See SYMPTOM LIST table.
- The presence of DTCs which begin with "U" indicate some other module is not communicating. The following procedure will compile all the available information before tests are performed. If scan tool displays DTCs which begin with "U", perform appropriate test. See BODY CONTROL MODULES . If scan tool does not display DTCs which begin with "U", perform appropriate test. See BODY CONTROL MODULES .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.